Automatic choker-valve for presses.



No. 353,167. Y

A; w. EEENSH E P. E. WEIDNEE. AUTOMATIC SEOKEE VALVE EOE PRESSES.

' APPLICATION FILED .TUNE 30. 1904.

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. PATENTBD MAY 7, 1907. A. W. FRENCH & P. G. WEIDNER. lAUIOlVIATIG GHOKERy VALVE FOR PRESSES.

I APPLICATION FILED JUNE 30. 1904.

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UNITED sTATEs PATENT Eric.

ALFRED W. FRENCH AND PAUL G. WEIDNER, OF PIQUA, OHIO, ASSIGN ORS TO FRENCH OIL MILL MACHINERY COMPANY, OF PIQUA, OHIO.

AUTOIVIATIC CHKER-VALVE FOR PRESSES.

Specification of Letters Patent.

Patented May 7, 1907.

Application tiled lune 30,1904. Serial No. 214,760.

To all whom it may concern:

Be it known that we, ALFRED W. FRENCH and PAUL G. WEIDNER, citizens of the United States, residing at Pi ua, in the county of Miami and State of Olio, have invented a new and useful Improvement in Automatic Choker-Valves for Presses, of which the following is a specification.

This invention relates to automatic choker valves of the character disclosed in United States Letters Patent No. 715,365, granted to Alfred W. French Dec. 9, 1902, which are employed in connection with hydraulic pressesfor admitting a considerable volume of the press operating liquid from the accumulator to the press at the commencement of the pressing operation to rapidly move the ram or press plunger until the latter meets with a predetermined resistance, when the flow of the operating liquid to the press is automatically restricted or lessened to reduce the speed of the ram or press plunger.

The ivention is particularly applicable to presses used for expressing oil from seeds, meal and other oleaginous substances, for preventing the injury to the press cloths and waste of the substance being operated upon which would ensue from a too rapid movement of the press plunger at the time when t'he oil first begins to run, as fully explained in said patent. In said patented. device the choker valve proper is actuated by-the press o erating fluid through the instrumentality of a separate iiuid actuated plunger and a weighted lever. te The object of this invention is to simplify the construction of such automatic choker valves and provide an efficient valve which is actuated by the direct pressure thereon of the ress operating liquid without any interme iary devices.

In the accompanying drawings, consisting of two sheets: Figure l is a sectional elevation of an automatic choker valve embodying the invention, showing the valve off of its seat. Fi 2 is a similar view thereof, showing the va ve seated. Fig. 3 is a similar view of a somewhat different form of valve, showing the valve 0H of its seat. Fig. 4 is a similar view of the valve shown in Fig. 3, with the valve seated.

Like letters of reference refer to like parts in the several figures.

Referring particularly t0 Figs. 1 and 2, A

relpresents a valve casing of any suitable form w ich is located in the press supply pipe or passage B which conducts the press operating liquid from the source of supply to the press. Oil expressing presses are frequently operated by oil supplied from an accumulator or distributing reservoir in which the oil is maintained under a constant pressure, and the automatic choker herein described is more especially adapted for use in such a system where the liquid supply pressure is constant. The valve casing A may constitute a part of the casing of the automatic change valve commonly employed, or it may be a separate casing located at a suitable point in the press supply pipe. It is provided with a choker valve chamber C which is preferably cylindrical and dis osed vertically in the casing and has an en arged upper end c. 'The valve chamber connects with the press sup' ply pipe on the supply and press sides of the casing by inlet and outlet passages d d, respectively.

Erepresents the automatic choker valve which is arran edto slide vertically in its chamber C. T` e valve shown in said Figs. 1 and 2 is cylindrical 'and solid andhas an enlarged head which is located in the enlarged upper end of the valve chamber, and has a conical under face e which co-operates with a conical annular shoulder ein the valve chamber. The conical face of the valve is notched or grooved at c2 to afford a restricted passage for the press operating liquid when the valve is seated'. Below its conical face the valve has contracted portions forming annular passages e3 e4 Awhich are separated by a guide flange e5 and communicate with each other by one or more longitudinal passages e6 through said guide iiange. e7 is a depending stem or part which extends outside of the valve casing through an ordinary packing gland. The enlarged upper end of f' the choker valve chamber has free and uninterrupted communication at all times with the press supply pipe on the press side of the choker valve, so that vr-a predetermined change of pressure in said pipe between the press and the valvewill immediately in# luence the valve to seat the 'same or permit the valve to move from lits seatjas presently explained. The upper end of the valve IOO - chamber is preferably closed by a removable I casing are connected by the annular passages e3 e'1 and longitudinal passages e of the valve, thus permitting a free or rapid flow of the press operating liquid past the choker valve to the press, to effect a rapid movement of the press plunger. The choker valve can be held off of its seat by the pressure of the press operating liquid, -as.hereinafter described, but preferably a weighted lever I is employed for this purpose. The lever is pivoted at i on the valve casing with one arm beneath the end of the depending valve stem, and carries an adjustable weight i on its other arm. The weighted lever holds vthe choker valve off of its seat until the back pressure in the press sup ly pipe and on the enlarged upper end of t e valve increases sufficiently, on account of the increasing resistance' of the material in the press to the movement of the press plunger, to predominate over the liftin action of the weight and seat the valve. Wren the valve is seated, only a restricted flow of the press operating liquid through the small notch e2 of the valve is permitted and the speed ofthe press plunger is therefore reduced. When the pressure is decreased sufficiently in the press supply pi e between the press and the valve by the ischarge of the operating liquid from the press cylinder, the valve is again lifted by its Weighted lever.

By adjusting the weight Z/ on the lever toward and from the fulcrum of the latter the valve can be controlled to operate at different desired pressures, which is an advantage as the valve can be thus set to `,operate at different pressures and be used in press systems in which the pressure of the press operating liquid varies. The weight acts only to hold the valve off of its seat, and the valve is seated by the direct action of the press operating liquid on the valve, and as the upper end of the valve is always exposed to the pressure in the press supply pipe between the press and the valve it responds quickly when this pressure exceeds or falls below the desired predetermined value.

Figs. 8 and. 4 disclose an automatic choker constructed to be both held off of its seat and seated by the direct action of the press operating liquid thereon. In this form of the device the chamber C for the automatic choker valve connects at its opposite ends with the inlet and outlet passages d d in the valve from its chamber.

casing by ports 7c Zr', respectively, and also intermediate of its ends by ports k2 7c3. The choker valve has enlarged cylindrical portions Z Z connected by a reduced waist portion forming an annular passage Z2 around the valve, and a reduced end portion or stem which preferably works in an ordinary removable packing gland Z3, which enables the insertion of the valve into and its removal The upper enlarged portion has one or more small grooves or notches Z4 in its sides to permit a restricted flow of the press operating liquid to the press.

The operation of this vvalve is as follows: The areas of the opposite inner ends of the enlargements Z Z are substantially equal and the opposing pressures on these faces practically balance each other, but the area of the outer end of the lower enlargement Zl is smaller than that of the outer end of the other enlargement Z on account' of the stem at the lower end of the valve and the pressures on these faces are unbalanced. The pressure on the accumulator side of the valve acting on the lower end of the lower enlargement Z is, for eX- ample, five hundred pounds per square inch, whereas only about twenty-five pounds per square inch is required to lift the press ram. Before the press valve is opened the choker occupies its lower position, shown in Fig. 4,'

and when the press valve is opened, as the only escape for the liquid past the choker to the press cylinder is through the small grooves Z4, the greatly predominating accumulator pressure on the lower end of the lower en- IOO largement of the choker quickly lifts the latter to the position shown in Fig. 3, thus affording a free passage for the liquid. The valve remains in this position and admits a large volume of liquid to the press cylinder until the pressure on the upper end of the upper enlargement Zis sufficient to balance the opposing accumulator pressure. This means a rapid movement of the press ram until the slack is taken up, when the back pressure of the liquid in the passage on the press side of the choker valve will increase to such an eX- tent that, acting on the larger area of the upper end of the valve, it will overbalance the opposing accumulator pressure and return the valve to its choking position, shown in Fig. 4, thereby restricting the flow of the liquid past the choker valve and reducing the speed of the press ram. The choker will not lift again until the press valve is again opened to admit the liquid to the press cylinder.

The form of valve just described is desirable as the weighted lever is not a necessary adjunct thereto, but the operation of the valve cannot be regulated as in the valve iirst described.

While each of the valves described is provided with grooves or notches for the restricted flow of the press operating liquid, an

provide a small by-pass passage through the valve or some suitable part of the valve casing, and such construction is within the spirit of this invention.

We claim as our invention:

1. The combination with a passage supplied with liquid under pressure, of a choker valve which controls said passage and is constructed and arranged to open said passage and permit a free flow of liquid past the valve when in one position and to permit a restricted flow of liquid when in another position, said valve having a part upon which the liquid acts directly to move the valve to and hold it in its restricting position when the back pressure of the liquid in the passage reaches a predetermined value, and means for releasably holding said valve against movement to the restricting position, substantially as set forth.

2. The combination with a passage for the press operating liquid supplied with liquid under pressure, of a one-part choker valve which controls said passage and is constructed and arranged to open said passage and permit a free flow of the liquid past the valve to the press when the valve is in one position, and to permit a restricted iow of the liquid when the valve is in another position, said valve having a part upon which the liquid acts directly to move the valve to and hold it in its restricting position when the back pressure of the liquid in said passage between the valve and the press reaches a predetermined value, and means for releasably holding said valve against movement to the restricting position, substantially as set forth.

The combination with a passage supplied with liquid under pressure, of a valve chamber having inlet and outlet connections with said passage, an automatic choker valve in said chamber, said valve and chamber being constructed to afford a free passage for the liquid when the valve is unseated and a restricted passage for the liquid when the valve is seated, said valve having a part upon which the liquid in said passage on the outlet side of the valve chamber acts directly at all times tending to seat said valve, and means which automatically hold the valve oii of its seat until the back pressure of the liquid in said passage at the outlet side of the valve chamber reaches a redetermined value, substantially as set forth).

4. The combination with a passage supplied with liquid under pressure, of a onepart choker valve which controls said passage and is constructed and arranged to open said passage and permit a free ilow of liquid past the valve when in one position and to permit a restricted flow of liquid when in anotherposition, said valve having a part upon which the liquid acts directly to move the valve to its restricting position when the back pressure of the liquid in the passage at the outlet side of the valve chamber reaches a predetermined value, and an adjustable device for releasably holding said valve against movement to the restricting position,

substantially as set forth.

5. The combination with a passage supplied with liquid under pressure, of a valve chamber having inlet and outlet connections with said passage, an automatic choker valve in said chamber which is constructed to afford a free passage for the liquid when unseated and a restricted passage for the liquid when seated, and which has a part upon which the liquid in said passage on the outlet side of the valve chamber acts directly at all times tending to seat said valve, a lever and adjustable weight which automatically hold the valve olf of its seat until the back pressure ofthe liquid in said passage at the outlet side of the valve chamber reaches a certain value, depending upon the adjustment of said weight, substantially as set forth.

6. The combination with a passage sup-f plied with liquid under pressure, of a valve chamber having inlet and outlet connections with said passage, said valve chamber being infree communication at all times with said passage through said outlet connection, a solid choker valve in said chamber having a reduced waist portion between its ends which in one position of the valve allows a free How of the liquid from said inlet connection to said outlet connection, and means for automatically holding the valve in said position, said valve having one or more notches which in another position' of the valve allows a restricted flow of the liquid, and also having a face which is exposed at all times to the 'direct pressure of the liquid in said passage on the outlet side of said valve chamber and which is of such area that a redetermined back pressure thereon of the liquid in the passage on the outlet side of the valve will move said valve against the opposing pressure of said holding means to the restricting position, substantially as set forth.

Witness our hands, this 20 day of June, 1904.

ALFRED W. FRENCH. PAUL G. WEIDNER.

Witnesses:

C. B. JAMisoN, FLORENCE HUNNTER.

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